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Discussion Starter · #1 ·
I am replacing an engine in an S10.
The new engine is a 2007, 4.3
I'm putting it in a 1997.
I have a few questions and any other advice anyone might share is also appreciated.
What type of retainer is needed on the timing gear bolts?
Will a heavy duty timing set fit this engine, it appears I would need to toss the tensioner.
Also, what are the two, different thread size, plugs next to the cam for?
Lastly, should I bother changing the cam expansion plug, I did the freeze plugs, all looked new.
Pics below.
 

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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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What did the S-10 guys say?

Beside that it might or might not fit...
I'm confused by your pictures.
In the photo, which chain are you wanting to use?
The loose one (on top of engine last photo) or the one already assembled?
The assembled one (with colored sprocket) look MUCH beefier
 

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Discussion Starter · #7 ·

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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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I've been running gear-drives in all my engines for the past 30 years.
Sorry no help with the chain.

I'm sure crank sprocket thickness is an important issue regarding line-up of harmonic balance and external pulleys.

I always use cam gear-drives.. but in my small & big block V8's
They don't fail. I have one in the 350 (30 years) in my 92 Astro.
I don't know if they make them for the 4.3 V6
Gear Font Bicycle part Circle Auto part


 

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You can't use gearsets with EFI engines because they play hell with knock sensors. Also some can't be used with roller cams for whatever reason. That said, I would love to put one on mine but the wife would have a coniption. 😃
 

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2000 Lifted 4x4 Astro 92 V8-350 Shorty
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Mine is used with a roller cam on my older 400 carbureted engine
(but NO knock-sensor)

I understand the conflict issues with a modern fuel-injection system, although there may be work-around's for that. None the less, I doubt they would be practical or worth the effort.

My 400, my 350, 454, and my 502 are my most recent builds (in past 30 years)
I also still have these engines (all on stands except 350 which is in my 92)
I am not a professional builder, this is just hobby level for my own use.
I would never rebuild a V6 (not that there is anything wrong with that)

The last time I used a timing chain was a dual chain (back in the 80's)

The gear whine doesn't bother me (sounds a little like a blower), although they make quiet ones too.

Here's the gear-drive in my carbureted 350 in my 92 Astro...
Gear Bicycle part Rim Font Machine


Sorry I got a little "off-track"... back to the timing chains
 

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1992 Astro - Silver / Gray / 4 Wheels
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My Question Marks were for the "all my engines" comment.

Did not think you did it w/ your V6.
 

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I was as surprised to see that drivetrain as you were seeing the balance shaft ( on certain builds ).
Which is, coincidently, gear drive.
And probably the main reason that cam gear train would not work anyway.
 

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2004 Safari RWD, 2002 Astro AWD
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How much do they go for these days. Its been a while since I looked at gear timing sprockets.
The vans do not really need it. In v8 blocks they can be useful.
I do like the thicker chain and sprocket that is being installed above post.
 

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Discussion Starter · #17 ·
There must be some differences in the timing sets.
I have a pick up sensor with a groove worn in it from rubbing on the gear.
They list different oil pan gaskets, but the pans are the same by appearance.
I didn't have an oil pan gasket in my set, and found my H-freight torque wrenches had locked up, so I've been delayed in the reassembly.
 
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